SMA MULTICLUSTER-BOX 6 User manual

MC-BOX-6-3-BE-en-30 | Version 3.0ENGLISH
Operating manual
MULTICLUSTER-BOX 6

Legal Provisions SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-302
Legal Provisions
The information contained in these documents is the property of SMA Solar Technology AG. No
part of this document may be reproduced, stored in a retrieval system, or transmitted, in any form or
by any means, be it electronic, mechanical, photographic, magnetic or otherwise, without the prior
written permission of SMA Solar Technology AG. Internal reproduction used solely for the purpose
of product evaluation or other proper use is allowed and does not require prior approval.
SMA Solar Technology AG makes no representations or warranties, express or implied, with
respect to this documentation or any of the equipment and/or software it may describe, including
(with no limitation) any implied warranties of utility, merchantability, or fitness for any particular
purpose. All such representations or warranties are expressly disclaimed. Neither SMA Solar
Technology AG nor its distributors or dealers shall be liable for any indirect, incidental, or
consequential damages under any circumstances.
The exclusion of implied warranties may not apply in all cases under some statutes, and thus the
above exclusion may not apply.
Specifications are subject to change without notice. Every attempt has been made to make this
document complete, accurate and up-to-date. Readers are cautioned, however, that product
improvements and field usage experience may cause SMA Solar Technology AG to make changes
to these specifications without advance notice or per contract provisions. SMA Solar Technology
AG shall not be responsible for any damages, including indirect, incidental or consequential
damages, caused by reliance on the material presented, including, but not limited to, omissions,
typographical errors, arithmetical errors or listing errors in the content material.
SMA Warranty
You can download the current warranty conditions from the Internet at www.SMA-Solar.com.
Trademarks
All trademarks are recognized, even if not explicitly identified as such. Missing designations do not
mean that a product or brand is not a registered trademark.
SMA Solar Technology AG
Sonnenallee 1
34266 Niestetal
Germany
Tel. [phone]
Fax [phone]
www.SMA.de
Email: [email protected]
As of: 2/23/2021
Copyright © 2021 SMA Solar Technology AG. All rights reserved.

Table of Contents
SMA Solar Technology AG
Operating manual MC-BOX-6-3-BE-en-30 3
Table of Contents
1 Information on this Document................................................. 5
1.1 Validity........................................................................................................................ 5
1.2 Target Group.............................................................................................................. 5
1.3 Levels of Warning Messages.................................................................................... 5
1.4 Symbols in the Document .......................................................................................... 5
1.5 Typographical Elements in the Document ................................................................ 6
1.6 Designations in the Document................................................................................... 6
1.7 Additional Information............................................................................................... 6
2 Safety ........................................................................................ 7
2.1 Intended Use .............................................................................................................. 7
2.2 IMPORTANT SAFETY INSTRUCTIONS.................................................................... 7
3 Scope of Delivery ..................................................................... 9
4 Product Overview .................................................................... 10
4.1 Product Description.................................................................................................... 10
4.2 Symbols on the Product ............................................................................................. 11
4.3 System Structure......................................................................................................... 12
5 Mounting................................................................................... 13
5.1 Requirements for Mounting ....................................................................................... 13
5.2 Mounting the product ................................................................................................ 15
6 Electrical Connection ................................................................ 16
6.1 Overview of the Connection Area ............................................................................ 16
6.1.1 Interior View............................................................................................ 16
6.1.2 View from Below..................................................................................... 17
6.2 Connecting the Generator......................................................................................... 17
6.3 Connecting the Loads ................................................................................................ 18
6.4 Connecting the PV System......................................................................................... 19
6.5 Connecting the Sunny Island..................................................................................... 19
6.6 Grounding the Multicluster System........................................................................... 20
6.7 Connecting the Data Cable....................................................................................... 21
7 Preparing for Commissioning ................................................. 22
8 Disconnect from voltage sources ............................................ 23
9 Periodic Actions ........................................................................ 24

Table of Contents SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-304
9.1 Inserting Power Cables.............................................................................................. 24
9.2 Inserting Data Cables ................................................................................................ 25
10 General Maintenance Work ................................................... 27
11 Decommissioning the Product ................................................. 29
12 Technical Data .......................................................................... 30
13 Multicluster Technology Terms................................................ 34
14 Contact ...................................................................................... 36
15 EU Declaration of Conformity ................................................. 39

1 Information on this Document
SMA Solar Technology AG
Operating manual MC-BOX-6-3-BE-en-30 5
1 Information on this Document
1.1 Validity
This document is valid for:
• MC-BOX-6.3-11 (Multicluster-Box 6)
1.2 Target Group
The tasks described in this document must only be performed by qualified persons. Qualified
persons must have the following skills:
• Training in how to deal with the dangers and risks associated with installing, repairing and
using electrical devices, batteries and installations
• Training in the installation and commissioning of electrical devices and installations
• Knowledge of all applicable laws, standards and directives
• Knowledge of and compliance with this document and all safety information
1.3 Levels of Warning Messages
The following levels of warning messages may occur when handling the product.
DANGER
Indicates a hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
NOTICE
Indicates a situation which, if not avoided, can result in property damage.
1.4 Symbols in the Document
Symbol Explanation
Information that is important for a specific topic or goal, but is not safety-rele-
vant
☐
Indicates a requirement for meeting a specific goal
☑
Desired result

1 Information on this Document SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-306
Symbol Explanation
✖
A problem that might occur
Example
1.5 Typographical Elements in the Document
Typography Use Example
bold • Messages
• Terminals
• Elements on a user interface
• Elements to be selected
• Elements to be entered
• Connect the insulated
conductors to the terminals
X703:1 to X703:6.
• Enter 10 in the field
Minutes.
>• Connects several elements to be
selected
• Select Settings > Date.
[Button]
[Key]
• Button or key to be selected or
pressed
• Select [Enter].
# • Placeholder for variable
components (e.g., parameter
names)
• Parameter WCtlHz.Hz#
1.6 Designations in the Document
Complete designation Designation in this document
Multicluster-Box 6.3 Multicluster-Box
SunnyIsland 6.0H / 8.0H Sunny Island, battery inverter
1.7 Additional Information
For more information, please go to www.SMA-Solar.com.
Title and information content Type of information
SUNNYISLAND 4.0M / 6.0H / 8.0H Operating manual

2 Safety
SMA Solar Technology AG
Operating manual MC-BOX-6-3-BE-en-30 7
2 Safety
2.1 Intended Use
The Multicluster-Box is the main AC distribution board in a multicluster system. The multicluster
system forms an AC grid and is made up of a maximum of 2 clusters (each three-phase).
Do not exceed the maximum AC connection power of the Multicluster-Box. Cables with copper
conductors must be used for the installation.
The Multicluster-Box is designed for connection to TN-S- systems.
The Multicluster-Box must only be operated in conjunction with Sunny Island 6.0H (SI6.0H-13 /
SI6.0H-12) or Sunny Island 8.0H (SI8.0H-13 / SI8.0H-12). Always take the maximum AC
connection power and the permitted inverter combinations into account.
In terms of interference immunity, the product is suitable for EMC environment A, and in terms of
EMC emissions, it is suitable for EMC environment B (as per IEC 61439-1:2011).
The product is designed for indoor use only.
Only operate the product at temperatures between −-25°C and +60°C.
The Multicluster-Box is designed for use at altitudes of up to 2000 m above Mean Sea Level. If you
would like to use the Multicluster-Box at altitudes above 2000 m, contact Service (see Section14,
page36).
Use SMA products only in accordance with the information provided in the enclosed
documentation and with the locally applicable laws, regulations, standards and directives. Any
other application may cause personal injury or property damage.
Alterations to the SMA products, e.g., changes or modifications, are only permitted with the express
written permission of SMA Solar Technology AG. Unauthorized alterations will void guarantee and
warranty claims and in most cases terminate the operating license. SMA Solar Technology AG
shall not be held liable for any damage caused by such changes.
Any use of the product other than that described in the Intended Use section does not qualify as the
intended use.
The enclosed documentation is an integral part of this product. Keep the documentation in a
convenient, dry place for future reference and observe all instructions contained therein.
This document does not replace and is not intended to replace any local, state, provincial, federal
or national laws, regulations or codes applicable to the installation, electrical safety and use of the
product. SMA Solar Technology AG assumes no responsibility for the compliance or non-
compliance with such laws or codes in connection with the installation of the product.
The type label must remain permanently attached to the product.
2.2 IMPORTANT SAFETY INSTRUCTIONS
Keep the manual for future reference.
This section contains safety information that must be observed at all times when working.
The product has been designed and tested in accordance with international safety requirements. As
with all electrical or electronical devices, there are residual risks despite careful construction. To
prevent personal injury and property damage and to ensure long-term operation of the product,
read this section carefully and observe all safety information at all times.

2 Safety SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-308
DANGER
Danger to life due to electric shock when live components or cables are
touched
High voltages are present in the conductive components or cables of the product. Touching live
parts and cables results in death or lethal injuries due to electric shock.
• Do not touch non-insulated parts or cables.
• Disconnect the product from voltage sources and make sure it cannot be reconnected
before working on the device.
• Wear suitable personal protective equipment for all work on the product.
CAUTION
Risk of burns due to hot components
Some components and terminals inside the product can become hot during operation. Touching
hot components or terminals can result in burn injuries.
• Wear suitable personal protective equipment for all work on the product.
• After opening the product, wait until the components have cooled down.
NOTICE
Damage to the product due to sand, dust and moisture ingress
Sand, dust and moisture penetration can damage the product and impair its functionality.
• Do not open the product during a dust storm or precipitation.
• Close the product in case of interruption of work or after finishing work.
• Only operate the product when it is closed.
• Store the closed product in a dry and covered location. Observe storage conditions.
Effects of an emergency disconnection
Emergency disconnection on the battery inverter triggers the uncontrolled shutdown of the
system and unsaved data is lost.
• Only trip the emergency disconnection to avoid danger or consequential damage.
• In the event of an emergency disconnection, always check whether any fuse elements in
the product, such as circuit breakers, have tripped.
• If any fuse elements have tripped, reactivate these fuse elements.

3 Scope of Delivery
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Operating manual MC-BOX-6-3-BE-en-30 9
3 Scope of Delivery
Check the scope of delivery for completeness and any externally visible damage. Contact your
distributor if the scope of delivery is incomplete or damaged.
D
B
AC
G
E F
Figure 1: Components included in scope of delivery
Position Quantity Designation
A 1 Multicluster-Box
B 1 Switch cabinet key
C 1 Data cable for communication (5m, black)
D 3 Data cable for measurement and control signals (5m, red)
E 4 Sealing ring with washer (diameter: 6mm)
F 4 Sealing ring with washer (diameter: 8mm)
G 1 Operating manual and circuitry overview

4 Product Overview SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-3010
4 Product Overview
4.1 Product Description
The Multicluster-Box is an SMA multicluster technology device for off-grid systems, battery-backup
systems, and systems for increased self-consumption. The Multicluster-Box is a main AC distribution
board to which you can connect up to 2 clusters. Each cluster is three-phase and made up of 3 DC-
side, parallel-switched SunnyIsland 6.0H / 8.0H inverters with firmware version 3.5 or higher.
Functions of the Multicluster-Box include:
• Main AC distribution board for Sunny Island inverters, one generator, one load, and one PV
system
• Load shedding
• Automatic bypass and reverse current monitoring for the generator
• Active anti-islanding
B
A
ComSyncTn ComSyncOut
Sl v2/L3
BackupVtgCur
Sl v1/L2
BackupVtgCur
Mstr/L1
BackupVtgCur
L1 L2 L3
F4.1 F4.2 F4.3
Main Cluster
L1 L2 L3
F4.4 F4.5 F4.6
Ext. Cluster 1
NL1 L2 L3
PE NPE
N N PE PE
L1 L2 L3
F2
Loads
N PE
X1
Generator
N PE
X4
All Clusters
PE
X5
Equipotential
Busbar
L1 L2 L3 N PE
X3
PV-System
N N PE
X2
Loads
2A 2A 2A
L1 L2 L3
F1
Generator
Figure 2: Multicluster-Box with cabinet door open
Position Designation
A Type label
The type label clearly identifies the product. The type label must remain per-
manently attached to the product. You will find the following information on
the type label:
• Device type (Model)
• Serial number (Serial No. or S/N)
• Date of manufacture
• Device-specific characteristics
B Circuit breaker
Protects power cables of the connected inverters.

4 Product Overview
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Operating manual MC-BOX-6-3-BE-en-30 11
4.2 Symbols on the Product
Symbol Explanation
Beware of electrical voltage
The product operates at high voltages.
Beware of hot surface
The product can get hot during operation.
Observe the documentation
Observe all documentation supplied with the product.
Grounding conductor
This symbol indicates the position for connecting a grounding conductor.
WEEE designation
Do not dispose of the product together with the household waste but in accor-
dance with the disposal regulations for electronic waste applicable at the in-
stallation site.
Degree of protectionIP55
The product is protected against interior dust deposits and water that is di-
rected as a jet against the enclosure from all directions.
CE marking
The product complies with the requirements of the applicable EU directives.

4 Product Overview SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-3012
4.3 System Structure
SUNNY ISLAND
Load contactor
(MAIN AC DISTRIBUTION BOARD)
MULTICLUSTER BOX
PV main distribution box
(not included in the
delivery)
BATTERY
Generator contactor GENERATOR
LOAD
PV MODULES
PV INVERTERS
Sunny Island
contactor
BATTERY FUSE
Figure 3: Circuitry principle of a multicluster system – example with Multicluster-Box

5 Mounting
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Operating manual MC-BOX-6-3-BE-en-30 13
5 Mounting
5.1 Requirements for Mounting
Requirements for the mounting location:
WARNING
Danger to life due to fire or explosion
Despite careful construction, electrical devices can cause fires. This can result in death or serious
injury.
• Do not mount the product in areas containing highly flammable materials or gases.
• Do not mount the product in potentially explosive atmospheres.
Optimum mounting location
The ambient temperature influences the tripping threshold of the circuit breakers for the
connected battery inverters. The higher the temperature, the earlier the circuit breakers will trip.
At high ambient temperatures, the derating function of the battery inverters inhibits premature
tripping of the circuit breakers.
• To ensure optimum operation, mount and install the Multicluster-Box and the battery
inverters at the same location.
Requirements:
☐ A solid, flat support surface must be available for mounting.
☐ The mounting location must be suitable for the weight and dimensions of the product (see
Section12, page30).
☐ The mounting location must be less than 2000 m above Mean Sea Level. If you would like to
use the Multicluster-Box at altitudes above 2000 m, contact Service (see Section14,
page36).
☐ The mounting location must not hinder access to disconnection devices.
☐ All local requirements concerning minimum passage widths and escape routes must be
observed.
☐ The mounting location should be freely and safely accessible at all times without the need for
any auxiliary equipment (such as scaffolding or lifting platforms). Non-fulfillment of these
criteria may restrict servicing.
☐ All ambient conditions must be met (see Section12, page30).

5 Mounting SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-3014
Permitted and prohibited mounting positions:
90°
Figure 4: Permitted and prohibited mounting positions
Dimensions for mounting:
720
20
20
760
Ø 8
720
760
20
20
Figure 5: Position of the anchoring points(Dimensions in mm)

5 Mounting
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Operating manual MC-BOX-6-3-BE-en-30 15
5.2 Mounting the product
WARNING
Danger to life if raised or suspended loads tip over, fall or sway
Vibrations or careless or hasty lifting and transportation may cause the product to tip over or fall.
This can result in death or serious injury.
• All means of transport and auxiliary equipment used must be designed for the weight of the
product. Weight: 55 kg.
• Always transport and lift the product upright.
• Always maintain a sufficient safety distance from the product during transport.
• Wear suitable personal protective equipment for all work on the product.
Additionally required mounting material (not included in the scope of delivery):
☐ Four screws, washers and fastening material suitable for the support surface
Procedure:
1. Mark the position of the 4 drill holes and drill the holes. Use the recesses for the upper wall
mounting brackets and the holes for the lower wall mounting brackets.
2. If necessary, provide the 4 drill holes with suitable screw anchors.
3. Open Multicluster-Box with the switch cabinet key included in the delivery.
4. NOTICE
Damage to the product due to sand, dust and moisture due to missing
sealing rings
If sealing rings are missing, sand, dust and moisture can penetrate into the product and
damage it.
• Install the sealing rings as follows.
5. Place the supplied sealing rings and supplied
washers over suitable screws.
6. Attach Multicluster-Box to the wall with the suitable
screws, washers and sealing discs.
4x
7. Ensure that the product is securely in place.

6 Electrical Connection SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-3016
6 Electrical Connection
6.1 Overview of the Connection Area
6.1.1 Interior View
ComSyncTn ComSyncOut
Sl v2/L3
BackupVtgCur
Sl v1/L2
BackupVtgCur
Mstr/L1
BackupVtgCur
L1 L2 L3
F4.1 F4.2 F4.3
Main Cluster
L1 L2 L3
F4.4 F4.5 F4.6
Ext. Cluster 1
NL1 L2 L3
PE NPE
NNPE PE
L1 L2 L3
F2
Loads
N PE
X1
Generator
N PE
X4
All Clusters
PE
X5
Equipotential
Busbar
L1 L2 L3 N PE
X3
PV-System
N N PE
X2
Loads
2A 2A 2A
L1 L2 L3
F1
Generator
Fuses SIBUCTRL
C
A
B
IJ
DE F G H
Figure 6: Components and terminals inside the Multicluster-Box
Position Designation
A RJ45 jacks for connecting the data cables for control and measuring signals
B RJ45 jack for connecting the data cable for communication
CFuse switch-disconnectors F1 Generator for connecting the generator (L1, L2, L3)
DTerminals X1 Generator for connecting the generator (N, grounding conductor
(PE))
EFuse switch-disconnectors Loads for connecting the loads (L1, L2, L3)

6 Electrical Connection
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Operating manual MC-BOX-6-3-BE-en-30 17
Position Designation
FTerminals Loads for connecting the loads (N, grounding conductor (PE))
GTerminals PV-System for connecting the PV system (L1, L2, L3, N, grounding con-
ductor (PE))
H Miniature circuit breaker for connecting the SunnyIsland (L)
ITerminals Clusters for connecting the SunnyIsland (N, grounding conductor (PE))
JTerminal X5 Equipotential Busbar for connecting the grounding conductor (for
grounding the entire multicluster system)
6.1.2 View from Below
AB
Position Designation
A Base plate with membranes for inserting the power cables:
• 28 membranes for external cable diameters of 5mm to 11mm
• 48 membranes for external cable diameters of 10mm to 15mm
• 8 membranes for external cable diameters of 15mm to 25mm
• 2 membranes for external cable diameters of 19mm to 34mm
• 2 membranes for external cable diameters of 26mm to 35mm
• 2 membranes for external cable diameters of 26mm to 54mm
• 1 membrane for external cable diameters of 50mm to 110mm
B Two-part cable feed-through for inserting the data cables
6.2 Connecting the Generator
You can connect a three-phase generator to the Multicluster-Box, e.g., a diesel generator or
another grid-forming power generator. However, you also have the option of connecting it to the
utility grid. The line conductors L1, L2, and L3 are routed via a fuse switch-disconnector in the
Multicluster-Box. Fuse links with a nominal current of 80A are factory-installed.

6 Electrical Connection SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-3018
Utility grid connection:
☐ The VDE-AR-N 4105 rule must not apply to the utility grid.
☐ Connecting the utility grid to the Multicluster-Box must be permitted in accordance with the
local standards and directives and agreed with the grid operator.
☐ If the utility grid is directly connected to the Multicluster-Box, do not install a generator in the
multicluster system.
Generator output fuse influences dimensioning of the PV system power
cables
Remember that the size of the generator output fuse affects the dimensions of the PV system's
power cable (see Section6.4, page19).
Cable dimensioning:
If the generator does not have an output fuse, the power cable to the Multicluster-Box must be
protected against ground faults and short circuits. As an alternative, you can install an additional
distribution board close to the generator, especially if the cable routes are long.
Cable requirement:
☐ Conductor type: copper wire
☐ Maximum connectable conductor cross-section: 35mm²
Procedure:
1. Insert the power cables into the Multicluster-Box (see Section9.1, page24).
2. Connect the grounding conductor and the neutral conductor to the terminal X1 Generator as
labeled.
3. Connect the line conductor to the fuse switch-disconnector F1 Generator as labeled.
4. According to the type of cable routing and the installation conditions, determine the required
fuse link for the fuse switch-disconnector and insert it into the fuse switch-disconnector.
6.3 Connecting the Loads
The line conductors L1, L2, and L3 are routed via a fuse switch-disconnector in the Multicluster-Box.
Fuse links with a nominal current of 80A are factory-installed. The fuse switch-disconnectors are
required to protect the outgoing power cables from overload in stand-alone mode. Note that the
electric currents of the SunnyIsland, the PV system, and the generator can add up.
Cable requirement:
☐ Conductor type: copper wire
☐ Maximum connectable conductor cross-section: 35mm²
Procedure:
1. Insert the power cables into the Multicluster-Box (see Section9.1, page24).
2. Connect the grounding conductor and the neutral conductor to the terminal X2 Loads as
labeled. When doing this, do not connect the 2nd terminal N.

6 Electrical Connection
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Operating manual MC-BOX-6-3-BE-en-30 19
3. Connect the line conductor to the fuse switch-disconnector F2 Loads as labeled.
4. According to the type of cable routing and the installation conditions, determine the required
fuse link for the fuse switch-disconnector and insert it into the fuse switch-disconnector.
6.4 Connecting the PV System
Cable protection
The Multicluster-Box does not take the place of the distribution board of the PV system (PV
main distribution board).
• Install a circuit breaker and, if necessary, a residual-current device between the
Multicluster-Box and the PV system for protection and disconnection purposes.
• Adhere to all standards and directives for the installation of electrical devices and systems
applicable at the installation location.
Connection of other energy sources
Instead of a PV system, you can connect other energy sources (e.g., small wind turbine
systems) to the Multicluster-Box.
Cable dimensioning:
In the event of a short circuit, short-circuit currents caused by the generator will flow through the
unprotected power cable between Multicluster-Box and PV main distribution. If the generator fuse is
larger than the fuse in the PV main distribution board, the power cables must be dimensioned to
match the generator fuse.
The PV inverters and SunnyIsland do not need to be considered when planning line protection in
case of a short circuit, as they are designed to not to pose any danger to power cables during a
short circuit. Overload protection is guaranteed if the power cables to the PV system are at least
dimensioned for the feed-in power of the PV system.
Cable requirement:
☐ Conductor type: copper wire
☐ Maximum connectable conductor cross-section: 35mm²
Procedure:
1. Insert the power cables into the Multicluster-Box (see Section9.1, page24).
2. Connect the grounding conductor and the neutral conductor to the terminal X3 PV-System as
labeled.
3. Connect the line conductor to the fuse switch-disconnector X3 PV-System as labeled.
6.5 Connecting the Sunny Island
Fusing of the SunnyIsland inverters
The power cables of each Sunny Island inverter are fused with a 40A circuit breaker inside
the Multicluster-Box.

6 Electrical Connection SMA Solar Technology AG
Operating manualMC-BOX-6-3-BE-en-3020
Cable requirement:
☐ Conductor type: copper wire
☐ Maximum connectable conductor cross-section for a rigid cable: 25mm²
☐ Maximum connectable conductor cross-section for a fine-stranded cable: 16mm²
Procedure:
1. Insert the power cables into the Multicluster-Box (see Section9.1, page24).
2. Connect the grounding conductor and the neutral conductor to the terminal X4 All Clusters
as labeled.
3. Connect the inverters of the main cluster:
• Connect the line conductor of the master to L1 of the miniature circuit breaker F4.1 Main
Cluster.
• Connect the line conductor of slave 1 to L2 of the miniature circuit breaker F4.2 Main
Cluster.
• Connect the line conductor of slave 2 to L3 of the miniature circuit breaker F4.3 Main
Cluster.
4. Connect the inverters of the extension cluster:
• Connect the line conductor of the master to L1 of the miniature circuit breaker F4.4 Main
Cluster.
• Connect the line conductor of slave 1 to L2 of the miniature circuit breaker F4.5 Main
Cluster.
• Connect the line conductor of slave 2 to L3 of the miniature circuit breaker F4.6 Main
Cluster.
6.6 Grounding the Multicluster System
The neutral conductors inside the Multicluster-Box are not connected to the grounding conductor by
default. To ensure safe operation of the multicluster system, the following measures must be taken
prior to commissioning.
Cable requirement:
☐ Conductor type: copper wire
☐ Connectable conductor cross-section: 16mm² bis 120mm²
Procedure:
1. Insert the power cables into the Multicluster-Box (see Section9.1, page24).
2. Connect the grounding conductor to the grounding terminal X5 Equipotential Busbar and
connect it to the grounding busbar.
3. Ground the multicluster system outside the Multicluster-Box on either the generator side or the
load side. To do this, connect the neutral conductor to the grounding conductor, observing all
standards and directives applicable at the installation site.